<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    iframe {
      width: 1200px;
      height: 600px;
    }
  </style>
</head>
<body>
  <h1>我是一个iframe标签,下面是嵌入进来的</h1>
  <iframe src="https://www.taobao.com"></iframe>
</body>
</html>